/Engine/Source/Runtime/Core/Public/Serialization/PackageWriter.h
Read PackageData written by WriteMPCookMessageForPackage on a CookWorker. Called only on CookDirector.
bool TryReadMPCookMessageForPackage ( [FName](API\Runtime\Core\UObject\FName) PackageName, [FCbObjectView](API\Runtime\Core\Serialization\FCbObjectView) Message )